mirror of
https://github.com/fish-shell/fish-shell.git
synced 2026-04-21 00:31:15 -03:00
7c27c1e7d0
Commit 0893134543 (Added .editorconfig file (#3332) (#3313),
2016-08-25) trimmed trailing whitespace for Markdown file (which do
have significant trailing whitespace) but ReStructuredText does not,
and none of our Markdown files cares about this, so let's clean up
whitespace always.
57 lines
1.5 KiB
ReStructuredText
57 lines
1.5 KiB
ReStructuredText
begin - start a new block of code
|
|
=================================
|
|
|
|
Synopsis
|
|
--------
|
|
|
|
.. synopsis::
|
|
|
|
begin; [COMMANDS ...]; end
|
|
{ [COMMANDS ...] }
|
|
|
|
Description
|
|
-----------
|
|
|
|
``begin`` is used to create a new block of code.
|
|
|
|
A block allows the introduction of a new :ref:`variable scope <variables-scope>`, redirection of the input or output of a set of commands as a group, or to specify precedence when using the conditional commands like ``and``.
|
|
|
|
The block is unconditionally executed. ``begin; ...; end`` is equivalent to ``if true; ...; end``.
|
|
|
|
``begin`` does not change the current exit status itself. After the block has completed, ``$status`` will be set to the status returned by the most recent command.
|
|
|
|
Some other shells only support the ``{ [COMMANDS ...] ; }`` notation.
|
|
|
|
The **-h** or **--help** option displays help about using this command.
|
|
|
|
Example
|
|
-------
|
|
|
|
The following code sets a number of variables inside of a block scope. Since the variables are set inside the block and have local scope, they will be automatically deleted when the block ends.
|
|
|
|
::
|
|
|
|
begin
|
|
set -l PIRATE Yarrr
|
|
|
|
...
|
|
end
|
|
|
|
echo $PIRATE
|
|
# This will not output anything, since the PIRATE variable
|
|
# went out of scope at the end of the block
|
|
|
|
|
|
In the following code, all output is redirected to the file out.html.
|
|
|
|
::
|
|
|
|
begin
|
|
echo $xml_header
|
|
echo $html_header
|
|
if test -e $file
|
|
...
|
|
end
|
|
...
|
|
end > out.html
|